I am trying to ummap few symm devices using SYMCLI in a windows machine using the following commands

symconfigure commit -sid XXXX -file unmap_dev.cmd

Where unmap_dev.cmd contains:
unmap dev 020:024 from dir ALL:ALL;

Can I use a .txt file insted of .cmd file here?

How to create a .cmd file in windows?

Have never used SYMCLI in windows before..... appreciate your early reply.